The numbers you are reading are for the battery itself and only concern replacing the battery. Once the needle on the battery charger is in the green, the battery (if still good) should be good to go. For instance, a 2-amp scale and even a 10-amp scale is not too uncommon. https://batterymanguide.com/how-to-read-a-battery-charger-amp-meter A negative reading will indicate a bad battery charger, and you should replace it. Reading a battery charger amp meter isn't all that hard. Read the charger manual and make sure you understand how the charger works and what precautions are necessary. Green good, red bad. Remove both battery cables from the battery terminals. This piece can help you if you need to know what all those pins and needles on that ampere meter mean for your charging sessions. When the charger is switched on the needle of the meter moves to the desired amps, say ten amps. Reference Website: https://batterychargersexpert.comCredit: https://www.youtube.com/watch?v=ejW4MHdShT0***See the recommended products as below : ***- … All you have to do is make sure you are looking at the right scale and when you have it connected you look at the number that the needle is pointing too. Knowing how to test a battery charger, whether it’s for the rechargeable kind used in small appliances or the one that powers your automobile, can be useful for making sure that the device is reloading batteries to a usable level.The procedure for testing a battery charger is similar regardless of the type of battery you’re working with. But this piece also covers on other matters like some terminology and other considerations—getting to know how to read a battery charger amp meter … 3) Multiple Scales. The other poster already explained how to test if a battery can hold a charge. First remove the negative (black) cable and then the positive (red) cable. My newer charger has a "percent charged" meter on the front and when it reads 100% the charger is done charging the battery. To really test a battery, you need to take it to a shop, and have it load tested. Plug the battery charger and switch it on. It's that easy to read the meter on your battery charger. The last thing to remember is that certain battery chargers often have two amplifier scales if they can produce different amps. The number is how much charge the charger is putting off to the battery. If the charger has sufficient amount of power flowing through it, it's more than … When the battery gets full it won't be pulling as much charge. https://batterychargersinfo.com/how-to-read-battery-charger As the battery continues to charge, the needle moves down.When the needle has dropped to almost half of the desired amp, it means that the battery is fully … With new phone USB chargers 5v is standard across the board so the higher the amps you buy the better. Its as simple as that. 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